58 



Richard Franz, Judy Bauer and Tom Morris 



Sumter Upland 



Fig. 5. Map showing important physiographic units that might influ- 

 ence the distributions of species of the Upper Suwannee, Orange Lake, 

 and Marion assemblages in Alachua and Marion counties. 



Procambarus franzi, is associated with the eastern Fairfield Hills, south 

 of Orange Lake, whereas the Marion Assemblage occurs in a southern 

 extension of the Western Valley, the Sumter Upland, and the Oklawaha 

 portion of the Central Valley (at Silver Springs) (Fig. 5). Like the 

 Lower Suwannee, the Marion Assemblage includes an intergrade 

 population of Procambarus lucifugus. 



Hydrologically, the Orange Lake and Marion assemblages fall 

 within the Oklawaha River Drainage Basin as defined by Faulkner 

 (1973) and Lane and Hoenstine (1991). The Fairfield Hills area repre- 

 sents the extreme northwestern corner of the Silver Springs Drainage 

 Area, which has its outlet at Silver Springs on the Oklawaha River in 

 the Central Valley. The Marion Assemblage occurs both in the Silver 

 Springs Drainage Area (at Silver Springs on the Oklawaha River) and 

 the Rainbow Springs Drainage Area with its primary outlet through 

 Rainbow Springs on the (southern) Withlacoochee River (Lane and 

 Hoenstine 1991). 



